JPH0317831A - Optical disk controller - Google Patents

Abstract

PURPOSE:To reduce a managing load without necessitating an expensive medium wastefully by forming written sector information representing the fact that data is written on the fixed length sector of an inloadable direct-read-after-write (DRAW) type optical disk medium, and suppressing the write of the data on the medium when the information is read out. CONSTITUTION:The control part 21 of an optical disk controller 2, in the case of receiving a write instruction on the optical disk medium from a central processing unit 3, transmits an ID readout instruction to an optical disk device 1 via an interface part 24 to search an object sector. The control part 15 of the device 1, in the case of receiving the instruction, issues an instruction to start the readout of a bit pattern to a medium part 11 via a write/readout part 12, and it it also transmitted to an ID detecting part 13 and a specific pattern detecting part 14 if a head not shown in figure reads out it when it is returned to the control part 15 via the write/readout part 12. When the detecting part 14 detects a specific pattern byte 51, the fact is sent to the control part 15, and when it coincides with an object ID, the write instruction is issued to the device 1.

Description

TECHNICAL FIELD The present invention relates to an optical disc control device, and more particularly to a data writing method for preventing data destruction due to double writing in a non-rewritable write-once optical disc device.

BACKGROUND ART Conventionally, in this type of optical disk device, if data is accidentally written twice in the same sector of an optical disk medium, the data on the optical disk medium will be lost due to the recording characteristics of the optical disk medium, making it impossible to read the data. Especially important data was written to different optical disk media and managed in duplicate.

In conventional data destruction measures for write-once optical disk media, the same data is written to different optical disk media and managed in duplicate, which requires additional expensive optical disk media and requires double management. This has disadvantages in that it places a burden on the CPU and also burdens the operations and media management work involved.

Purpose of the Invention The present invention has been made to eliminate the above-mentioned drawbacks of the conventional ones, and reduces the load on the CPU and the burden of operation and media management work without requiring additional expensive optical disk media. The purpose of the present invention is to provide an optical disc control device that can perform the following functions.

Composition of the Invention An optical disk control device according to the present invention is an optical disk control device that controls an optical disk device that writes to and reads from fixed-length sectors of a write-once non-rewritable optical disk medium, wherein data is written to the fixed-length sectors. suppressing a command to the optical disk device to write to the optical disk medium in response to an interrupt signal output from the optical disk device when written sector information indicating that written sector information is read from the disk medium; It is characterized by having means.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, a medium section 11 of an optical disk device 1 directly writes and reads from an attached optical disk medium (not shown), and a write/read section 12 performs direct writing and reading from an attached optical disk medium (not shown).
Performs write and read control for.

The lD (identifier) section detection section 13 detects the synchronization byte of the ID section from the read data read from the optical disk medium, and sends the synchronization byte of the ID section to the control section 15.

The special pattern detection unit 14 detects the ID in the optical disk medium.
A special pattern byte (written sector information) is recorded in the unwritten area (gap) between the data area and the data area, and indicates that data is being written to the sector of the optical disk medium. The pattern byte is sent to the control unit 15.

The optical disc control device 2 includes a control unit 21 and a written sector address storage unit (hereinafter referred to as sector address storage unit).
22, a write request rejection interrupt detection unit (hereinafter referred to as interrupt detection unit) 23, and an interface unit 24,
Write and read control in the optical disc device 1 is performed.

The central processing unit 3 sends an access request to the optical disk medium to the optical disk device 1 via the optical disk control device 2, and writes and reads data to and from the optical disk medium.

FIG. 2 is a diagram showing the format of a data sector on an optical disc medium according to an embodiment of the present invention. In the figure, each data sector on the optical disc medium is provided with an ID section 4 and a data section 6 with a gap 5 in between.

The ID section 4 includes an ID section synchronization byte 41 and an ID (identification information) 4.
2 and C R C (cyclic redundancy)
y check) 43, and the data section 6 consists of a data section synchronization byte 61, data 62, and CRC-ECC (
error correcLing code) 6
It consists of 3. Further, a special pattern byte 51 indicating that writing has been completed is written in the gap 5.

The operation of an embodiment of the present invention will be explained using FIG. 1 and FIG. 2.

The control unit 21 of the optical disc control device 2 is a central processing unit Wt3.
When receiving a write command for the optical disk medium from
The interface unit 24 searches for the target sector.
An ID read command is sent to the optical disc device 1 via the.

The control unit 15 of the optical disc device 1 is the optical disc control device 2
Upon receiving an ID read command from the CPU 10, the CPU 10 immediately instructs the medium section 11 via the write/read section 12 to start reading out the bit pattern.

In the write/read unit 12, when a read head (not shown) reads a bit pattern from the optical disk medium according to an instruction from the control unit 15, the bit pattern is transmitted to the control unit 15 via the write/read unit 12, and The bit pattern is transmitted to the ID section detection section 13 and special pattern detection section 14 via the write/read section 12.

When the ID section detection section 13 detects the ID section same byte 41 from the bit pattern read from the optical disk medium,
Report this to the control unit 15, and the special pattern detection unit 14
When the special pattern byte 51 is detected from the bit pattern read from the optical disk medium, the controller 15 is notified of this fact.

Therefore, the iilr8 section 15 sends the data after receiving the detection report from the ID section detection section 13, that is, the ID42, to the optical disk control device 2.

The control unit 21 of the optical disc control device 2 controls the optical disc device 1.
of the data received from the optical disk device 1 after sending the ID read command to ! Check D42 and its ID4
The transmission of the ID successive command and the checking of the ID 42 transmitted from the optical disc device 1 in response to the ID read command are repeated until the ID 42 matches the target sector ID.

When the ID 42 from the optical disc device 1 matches the target sector ID, the control unit 21 transmits a data section write command to the optical disc device 1.

Here, even after the control unit 15 of the optical disc device 1 finishes transmitting the ID 42 to the optical disc control device 2, the reading operation from the optical disc medium continues, and the special pattern byte 51 is detected from the special pattern detection unit 14 within a specified time. If it is not reported that data has been read, it is determined that no data has been written to the data section 6 of the target sector yet, and a write data transmission request is sent to the optical disc controller 2.

After transmitting a data section write command to the optical disc device 1, the control unit 21 of the optical disc control device 2 sends a data part write command to the optical disc device 1, and when the interface unit 24 notifies the reception of the write data transmission request from the optical disc device 1 within a specified time, the central processing Device 3
It receives write data from the optical disc device 1 and transmits the write data to the optical disc device 1 via the interface section 24.

Thereafter, when the control unit 21 detects that the writing operation of the write data to the data section 6 of the optical disc medium is completed based on the report from the optical disc device 1, the central processing unit 21
At the same time, the normal completion of the write command is reported to the sector! The address of D is stored in the sector address storage section 22.

The control unit 21 selects the sector I of degree 11 based on the address of the sector ID stored in the sector address storage unit 22.
D and sends a written flag write command to the optical disc device 1.

The control unit 15 of the optical disc device 1 is the optical disc control device 2
When a written flag write command is received from the media section 11, a special pattern byte 51 is placed in the middle of the gap 5 between the ID section 4 and the data section 6 of the optical disk medium.
is written, and the optical disc controller 2 is notified that writing of this special pattern byte 51 has been completed.

On the other hand, after the control section 15 of the optical disk device 1 finishes transmitting the ID 42 to the optical disk control device 2, the special pattern byte 51 is read out from the special pattern detection section 14 within a specified time by continuing the reading operation from the optical disk medium. If it is reported that data has been written to the target sector, it is determined that data has already been written to the data section 6 of the target sector.
A write request rejection interrupt is sent to the optical disc control device 2.

After the optical disk control device 2 transmits the data section write command to the optical disk device 1, it waits for a specified time to receive a write data transmission request from the optical disk device 1; In the meantime, when the interrupt detection unit 23 detects reception of a write request rejection interrupt from the optical disk device 1 and notifies the control unit 21 of this, the control unit 21 notifies the central processing unit 3 of abnormal termination of the write command. However, the processing of the write command is thereby suppressed.

In this way, the special pattern byte 51 (written sector information) indicates that data has been written corresponding to each sector from a non-rewritable write-once optical disk medium.
By notifying the central processing unit 3 of abnormal termination in response to a write request rejection interrupt sent from the optical disk device 1 when the write command is read, and suppressing the write command, software errors can be prevented. It is possible to prevent double writing on optical disk media caused by errors or mistakes.
IL prevents data destruction due to double writing to optical disk media
can do.

In addition, it is possible to prevent double writing on optical disk media caused by software errors or operational errors.
There is no need for double management of writing the same data on different optical disk media, and no additional expensive optical disk media is required.

This makes it possible to prevent double writing to the optical disc medium, so that other optical disc devices can also write to the optical disc medium.

In one embodiment of the present invention, the special pattern byte 51 indicating that data has been written is written in the gap 5 between the ID section 4 and the data section 6. It is possible to record data all at once on a specific track in association with a sector, or to record at a certain sector position on each track, and these are not specified.

Effects of the Invention As explained above, according to the present invention, when written sector information indicating that data has been written to a fixed length sector of a non-rewritable write-once optical disk medium is read, the optical disk device By inhibiting the optical disk device from writing data to the optical disk medium in response to an interrupt signal output from the device, the CPU load and operation can be reduced without requiring an extra expensive optical disk medium. This also has the effect of reducing the burden of media management work.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a diagram showing the format of a data sector on an optical disk medium according to an embodiment of the invention. Explanation of symbols of main parts 1... Optical disc device 2... Optical disc control device 4... ID section 5... Gap 6... Data Section 11...Medium section 12...Writing/reading section 13...ID section detection section 14...Special pattern detection section 21...Control Section 23...Write request rejection interrupt detection section 51...
...Special pattern bite diagram 1

Claims (1)

[Claims] (1) An optical disk control device that controls an optical disk device that writes to and reads from a fixed-length sector of a write-once non-rewritable optical disk medium, the writing indicating that data has been written to the fixed-length sector. The present invention is characterized by further comprising a suppressing means for suppressing a write instruction to the optical disk medium to the optical disk device in response to an interrupt signal output from the optical disk device when completed sector information is read from the disk medium. Optical disk control device.